    $ sudo tee /etc/apt/sources.list.d/debusine.sources <<END
    Types: deb
    URIs: https://deb.debusine.freexian.com/freexian/debusine
    Suites: trixie-devel
    Components: main
    Signed-By:
      -----BEGIN PGP PUBLIC KEY BLOCK-----
      .
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      65r8wEa0KUFyY2hpdmUgc2lnbmluZyBrZXkgZm9yIGZyZWV4aWFuL2RlYnVzaW5l
      iJAEExYKADgWIQT8mEBDdxrXXLXVVA1rNLmlWenTHAUCaaX1bAIbAwULCQgHAgYV
      CgkICwIEFgIDAQIeAQIXgAAKCRBrNLmlWenTHDBIAP0S1OwE1zTfV+0jFXYZW6J8
      dcS+fKF1S1YCi6cXLuWzZwEApcVXixlRDzOmQQBymyG35nf2ZRYFuhLOlkD/Ad/W
      Xg8=
      =VWZC
      -----END PGP PUBLIC KEY BLOCK-----
    END
    $ sudo apt update